﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Cosmos.Hardware.BlockDevice {
  public class Partition : BlockDevice {
    BlockDevice mHost;
    UInt64 mStartingSector;

    public Partition(BlockDevice aHost, UInt64 aStartingSector, UInt64 aSectorCount) {
      mHost = aHost;
      mStartingSector = aStartingSector;
      mBlockCount = aSectorCount;
      mBlockSize = aHost.BlockSize;
    }

    public override void ReadBlock(UInt64 aBlockNo, UInt32 aBlockCount, byte[] aData) {
      UInt64 xHostBlockNo = mStartingSector + aBlockNo;
      CheckBlockNo(xHostBlockNo, aBlockCount);
      mHost.ReadBlock(xHostBlockNo, aBlockCount, aData);
    }

    public override void WriteBlock(UInt64 aBlockNo, UInt32 aBlockCount, byte[] aData) {
      UInt64 xHostBlockNo = mStartingSector + aBlockNo;
      CheckBlockNo(xHostBlockNo, aBlockCount);
      mHost.WriteBlock(xHostBlockNo, aBlockCount, aData);
    }
  }
}